Collapsible core-spindle.



No. 766,765. PATENTED AUG. 2, 1904. W. H. LARRISON.

GOLLAPSIBLE GORE SPINDLB.

APPLICATION FILED JAN. 2, 1904.

No. 766,765. PATENTED AUG. 2, 1904.

- w. H. LARRISON.

COLLAPSIBLE GORE SPINDLE,

APPLICATION FILED JAN. 2. 1904.

N0 MODEL. 2 SHIJETSSHEBT 2.

UNITED STATES Patented August 2, 1904.

PATENT OFFICE.

W\*1LLI1\M H. LARRISON, OF FLORENO 1, NE\V JERSEY, ASSIGNOR OF ONE- HALFTO \VILLIAM F. THACHER, OF FLORENCE, NEE JERSEY.

COLLAPSIBLE CORE-SPINDLE.

SPECIFICATION formingpart of Letters Patent N0. 766,765, dated August 2,1904,

Application filed January 2,1904.

T0 (tZZ whom it may concern.-

Be it known that I, \VILLIAM H. LARRISON, a citizen of the UnitedStates, and a resident of Florence, Burlington county, New Jersey, haveinvented certain Improvements in C01- lapsible Core-Spindles, of whichthe following is a specification.

My invention relates to certain improvements in core-spindlesparticularly designed to receive a covering of sand or plastic materialfor use in connection with a suitable mold for the formation of acasting.

The object of the invention is to provide a core-spindle especiallyadapted for use in the manufacture of pipe or similar tubular articleswhich shall be of such construction as to be quickly and easily made ofa smaller diameter, so as to permit of its removal from a casting.

A further object of the invention is to provide a collapsiblecore-spindle whose operating parts shall be few in number andsubstantial in construction and which are so arranged that the pressureexerted upon the device by the cooling of the metal of a casting willnot in any way alter their adjustment. It is also desired to provide acollapsible core-spindle having its surface composed of a number ofsections which shall be independently adjustable under certainconditions of operation.

These objects I attain as hereinafter set forth, reference being had tothe accompanying drawings, in which Figure 1 is a longitudinal sectionalelevation of my improved collapsible core-spindle, illustrating thedetail construction of its component parts. Fig. 2 is a transversesectional elevation of one end of my improved spindle. Fig. 3 is anelevation of the end of the spindle opposite to that shown in Fig. 2, aportion thereof being removed for the sake of clearness. Fig. 4 is aside elevation of the end portion of the improved spindle shown in Fig.3, one of the staves of the spindle being removed to better illustratethe detail construction; and Figs. 5 and 6 are sectional elevations ofportions of my improved spindle, showing a modified constructionthereof.

In the above drawings, A represents the Serial No. 187.490. (N0 model.)

supporting spindle or shaft for my core-spindle, and this has keyed toit or otherwise fixed in position near its ends two head-pieces B and O,which are preferably circular in form, it being noted that I do notlimit myself to any particular number of said head-pieces. Extendingbetween the heads in such manner as to inclose the head O are any numberof body-sections or staves .D, which are provided with fiangeil portions(1 at the ends adjacent to the head B. These flanged portions or flangesmay be external, as shown in Fig. 1, or internal, as shown at (Z in Fig.5, for the reception of U-shaped clamps I), which extend in one casethrough a groove in the periphery of the head B or in the other casethrough an opening in the body of said head in such manner as to holdtogether the body-sections and the head, it being thus possible to drawsuch parts together with any desired force by means of a wedge b,inserted between the head B and one of the arms of the clamp.

Each of the body-sections D has bolted to it one or more projecting lugs(Z which preferably extend beyond the plane of the ends of said sectionsin lines at an angle to the axis of the spindle. The head B is providedwith correspondingly-shaped openings, as indicated in Figs. 1 and 2, forthe reception of said lugs, and each opening is made of such dimensionsas to permit the insertion of a wedge between its walls and the lugprojecting therethrough, as indicated at d.

The openings through the head B are, like the ends of the projectinglugs (Z inclined at an angle to the axis of the spindle, so that it willbe seen that inward movement of a lug through the head B not only movesits attached bodysection or stave longitudinally, but also moves thesame toward or from the spindle A.

In addition to the lugs (Z there are on each body-section one or morelugs cl", which are also removably bolted in position and project fromthe inner surface of their supportingsections at the same angle to thespindle A as that made by the similar portions of the lugs For thepurpose of accommodating this second set of lugs the head O is made intwo parts 0 and c. The first of these, a, is conical I lapsed or madesmaller in diameter.

shaped lugs (F can be moved but a limited distance through them. Theportion 0 of the head G has a flanged portion 0 which en-,

circles the conical surface of the part0 and is preferably made so as toengage the lugs (Z and force them inwardly when they are moved throughthe recesses in the part 0.

Any desired form of screw or bolts 0 may be employed to retain the twoparts 0 and 0 together. There are ribs (Z formed on the external surfaceof the staves or body portions D for the purpose of better holding thesand or clay, and it will be understood that said staves fit together insuch a manner as to form a substantially cylindrical core-spindle.

In preparing my improved device for use each of the body-sections orstaves is moved toward the head B until further motion is stopped by theengagement of the large ends of the lugs (Z* with the sides of thetapered dovetailed slots in the portion 0 of the head C. Each stave isthen permanently retained in position by means of the clamp 7) or thewedge (Z or both, after which the sand or other coreforming substance ismolded upon the outside surface of the staves. After suitable drying thefinished core is placed in a mold and metal cast upon it, and when saidmetal is sufliciently cooled the removal of the clamps and wedges leavesthe core-spindle in condition to be col- This is accomplished either bymoving the spindleA and its heads relatively to the casting and thestaves D or by forcing the lugs 6Z2 through the head B one at a time, inany case freeing them from the casting and permitting easy withdrawal ofthe core-spindle. It will be noted that the drawing in of the ends ofthe staves connected to the head 0 is due to the action of the flangedportion of the part 0 upon the lugs 6Z5 This ability to slack off andmove inwardly or outwardly one of the body-sections at a time is a verymaterial advantage, since, particularly in large work, it is practicallyimpossible to move them all simultaneously and lock them rigidly.

It will be understood that in practice both the staves and the heads ofmy improved core are provided with a large number of perforations forthe escape of gas; but for the sake of clearness these have not beenshown in the drawings, since they in no way affect the present inventionand relate solely to a construction well known to the art. It will being the lug d is first brought to a fixed position, after which the lug(Z is fixed relatively to the head B by means of the wedge (13.

If desired, the lugs (Z may be replaced by a construction similar tothat shown in Fig. 6, in which 6 represents a metallic piece fastened tothe outside of a stave D and extending through a groove in the edge ofthe head B. The end of the piece is turned over and bent at an angle, soas to enter the angularlyplaced opening in said head, there being awedge (Z by which it may be moved, so as to draw the end of the stave towhich it is attached toward the head.

I claim as my invention 1. In a collapsible core-spindle the combinationof a supporting-shaft having heads, staves having means whereby theirlongitudinal motion in one direction also causes them to move in a lineradial to the shaft, with means for retaining them in their most distantposition from the shaft, said staves being adjustable independently ofeach other, substantially as described.

2. The combination of a shaft having heads provided with recesses, 21.series of staves forming a substantially cylindrical body, each stavehaving a projecting flange extending substantially at right angles toits length, pieces inclined to the line of the shaft and fixed to thestaves, said pieces being operative in the recesses of the heads, and aseries of independent clamps placed to respectively connect the flangesof the staves and one of the heads on the shaft, substantially asdescribed.

3. The combination of a shaft having heads, one of said heads havingdovetailed and tapering recesses, a series of staves having meanswhereby they are operatively connected to the heads, said meansincluding projecting lugs shaped to cooperate with the dovetailedrecesses in one of the heads, substantially as described.

4. The combination of a shaft having recessed heads, a series of stavesforming a cylindrical core, means whereby each of the staves is movablyheld to one of the heads and a lug on each stave engaging a recessedportion of another head, with means for retaining said lug in anydesired position relatively to said latter head, substantially asdescribed.

5. The combination in a collapsible corespindle of a shaft having heads,staves forming a cylindrical body having means in engagement with saidheads for causing said staves to be moved toward or from the shaft whenthey are moved longitudinally, said means including a tapering lug fixedto each stave, there being a correspondingly-tapered recess for said lugin the head adjacent thereto, substantially as described.

6. In a collapsible core-spindle, the combination of a shaft havingheads each provided with recesses extending in lines inclined to theline of the shaft, staves forming a cylindrical body and each providedwith a lug for engagement with an inclined recess in each head, certainof said lugs being tapered and others being parallel-sided, with meansfor retaining said parallelsided lugs in a fixed position relatively tothe head with which they engage, substantially as described.

7. The combination of a shaft having heads, with a series of stavesforming a cylindrical core, each of said staves having means inengagement with the heads for maintaining it parallel to the shaft whenit is moved longitudinally, said means being constructed to permit thestaves to be at different distances from said shaft, with flanges on thestaves and independent means'for holding each stave to one of the heads,substantially as described.

8. The combination of a shaft having heads provided with inclinedrecesses, flanged staves forming a cylindrical body and provided withinclined portions for engaging the recesses of the heads, certain ofsaid inclined portions having means for limiting their longitudinalmotion relatively to one of the heads, and clamps for engaging theflanges of the staves and holding them to the other one of the heads,substantially as described.

9. The combination of a shaft having heads, a series of staves forming acylindrical body, lugs having inclined portions inengagement withsimilarly-formed recesses in one of the heads, another head being formedin two parts, one of the same being substantially conical in form andhaving recesses in its conical surface, lugs on the staves formed toengage said recesses, another portion of said head fitting around theconical surface of said first portion so as to retain the lugs therein,substantially as described.

10. The combination of a shaft having heads fitted to it, a cylindricalbody consisting of a number of independent sections, said sectionshaving fixed to them pieces inclined to the shaft and placed to entercorrespondingly-inelined recesses in the heads, the recesses in one ofthe heads being dovetailed and tapered and the pieces on the stavesadjacent thereto being of a similar shape, substantially as described.

11. The combination of ashaft having heads provided with recessesinclined to said shaft, staves having portions also inclined to theshaft and coacting with the recesses, means on certain of theprojections of the staves for limiting their motion relatively to thehead adjacent thereto, there being recesses in another head larger thanthe pieces coacting with them and wedges for said recesses for retainingthe pieces acting therein in any desired position, substantially asdescribed.

12. The combination in a collapsible corespindle of asu bstantiallycylindrical body consisting of a series of sections, and means forsimultaneously moving said sections toward the axis of said body so asto diminish the diameter of the cylinder formed by them, said meanspermitting outward motion of each section independently of the others,with means for independently holding each section in any adjustedposition, substantially as described.

In testimony whereof I have signed my name to this specification inthe'presencc of two subscribing witnesses.

VILLIAM H. LARRISON.

Witnesses:

DANIEL W. BISHOP, WVM. H. BODINE.

